JSFiddle - React, Tailwind, and code Playground

HTML

<base href="https://polygit.org/*+:master/components/">
<link rel="import" href="polymer/polymer.html">
<link rel="import" href="paper-dropdown-menu/paper-dropdown-menu.html">
<link rel="import" href="paper-listbox/paper-listbox.html">
<link rel="import" href="paper-item/paper-item.html">

<dom-module id="x-foo">
  <template>
    <paper-dropdown-menu>
      <paper-listbox class="dropdown-content" selected="100">
        <template is="dom-repeat" items="[[items]]">
          <paper-item>[[item]]</paper-item>
        </template>
      </paper-listbox>
    </paper-dropdown-menu>
  </template>
</dom-module>


<x-foo></x-foo>

JavaScript

/* Polymer({
  is: 'x-foo',
  properties: {
    items: {
      type: Array,
      value: function() {
        var arr = [];
        for (var i = 0; i < 200; i++)
          arr.push(i);
        return arr;
      }
    }
  },
}); */